Electronic Circuit Design Lab Manual
Electronic Circuit Design Lab (EE-209L)
(Spring 2023)
Lab Report # 12
Submitted By:
Name:
Roll No:
Submitted To:
Engr. Muhammad Aseer Khan
Department of Electrical Engineering
Air University - Aerospace and Aviation Campus,
Kamra
Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra
Electronic Circuit Design Lab Manual
EXPERIMENT NO 12
Class B Output Stage
OBJECTIVE:
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To understand how a Class B amplifier works and analyze its output.
EQUIPMENT:
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Function Generator
Power Supply
Digital Multimeter
Oscilloscope
Transistors (NPN 2N3904, PNP 2N3906)
Resistors
PROCEDURE:
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Connect the circuit as shown in figure below.
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Apply Vin = 5VP (f = 1kHz)
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Now with the help of DMM, measure the output current and Vo.
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Observe the output on oscilloscope.
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Fill in the required values.
 Circuit Diagram:
Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra
Electronic Circuit Design Lab Manual
Simulation results:
Practical results:
Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra
Electronic Circuit Design Lab Manual
Figure 1 Input voltage waveform.
Figure 2 Output voltage waveform.
Figure 3 Input current.
Figure 4 Output current.
Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra
Electronic Circuit Design Lab Manual
Figure 3 Hardware implementation of class B circuit.
OBSERVATIONS:
Vout = ……………………………
Iin = ………………...……………
Io = ………………………………
ANALYSIS QUESTION:
1. Why do Class B amplifiers have high efficiency?
Ans: ……………………………………………………………………………………………
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2. What type of distortion is present in Class B power amplifier?
Ans: ……………………………………………………………………………………………
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Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra
Electronic Circuit Design Lab Manual
3. What are Class B amplifiers used for?
Ans: ……………………………………………………………………………………………
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CONCLUSION:
Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra
Electronic Circuit Design Lab Manual
Department of Electrical Engineering – Air University Aerospace and Aviation Campus Kamra